Having sufficient nutrients in the body is a general goal for everyone. It doesn’t necessarily take great effort to achieve this goal. If you simply follow a diet rich in vitamins and minerals, you should be healthy. However, taking medication, genetics, and age can cause you to become vitamin or mineral deficient. Potassium is one such mineral that the elderly or those individuals who care for them should be aware.
Potassium is a mineral that, in combination with sodium and calcium, maintains normal heart rhythm, regulates the body’s water balance, and is responsible for the conduction of nerve impulses and the contraction of muscles. The body of an average-sized person contains about 5 ounces (140 g) of potassium. Blood levels of the mineral are controlled by the kidneys, which eliminate any excess in the urine.
Potassium deficiency is rare because almost all foods contain potassium. The best sources of potassium include lean meat, whole grains, green leafy vegetables, beans, and many fruits (especially bananas and oranges). A diet that includes these foods is sufficient for obtaining adequate amounts of potassium.
Since potassium sources are so abundant, for most people, potassium deficiency is not a concern. The elderly, however, are at a greater risk for potassium deficiency. The main reason the elderly should be concerned about sufficient deficiency is because their kidneys and other organs tend not to function as well. This results in the system not being able to absorb and regulate the amount of potassium in the body.
A potassium test checks how much potassium is in the blood. Potassium is both an electrolyte and a mineral. It helps keep the water (the amount of fluid inside and outside the body's cells) and electrolyte balance of the body. Potassium is also important in how nerves and muscles work.
Potassium levels often change with sodium levels. When sodium levels go up, potassium levels go down, and when sodium levels go down, potassium levels go up. Potassium levels are also affected by a hormone called aldosterone, which is made by the adrenal glands.
Potassium levels can be affected by how the kidneys are working, the blood pH, the amount of potassium you eat, the hormone levels in your body, severe vomiting, and taking certain medicines, such as diuretics and potassium supplements. Certain cancer treatments that destroy cancer cells can also make potassium levels high.
Many foods are rich in potassium, including bananas, orange juice, spinach, and potatoes. A balanced diet has enough potassium for the body's needs. But if your potassium levels get low, it can take some time for your body to start holding on to potassium. In the meantime, potassium is still passed in the urine, so you may end up with very low levels of potassium in your body, which can be dangerous.
A potassium level that is too high or too low can be serious. Abnormal potassium levels may cause symptoms such as muscle cramps or weakness, nausea, diarrhea, frequent urination, dehydration, low blood pressure, confusion, irritability, paralysis, and changes in heart rhythm.
Other electrolytes, such as sodium, calcium, chloride, magnesium, and phosphate, may be checked in a blood sample at the same time as a blood test for potassium.
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